PLEASE HELP!!! I need your guys help on this plant issue before these babies die!!!

600ppm is way to high to start with, thats ur prablem. by the time u put in ur nutriants and aditives ur way to high with the ppms. u have to use ro water. ur well water is way to hard. u r prabobly burning those babys.

or if ur not burning them and ur going by 600 ppms ur not able to add enough nutriants by the time u hit 1000 ppms. so id say u r starving them babys. the leaves do look like nitrogen deficncy. got it, good